<template>
  <el-card>
    <!-- 为 ECharts 准备一个具备大小（宽高）的 DOM -->
    <div ref="main" style="width: 100%;height:500px;"></div>
  </el-card>
</template>

<script>
import * as echarts from 'echarts'
export default {
  data() {
    return {}
  },

  mounted() {
    this.showEcherts()
  },

  methods: {
    showEcherts() {
      var myChart = echarts.init(this.$refs.main)
      var option = {
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            crossStyle: {
              color: '#999'
            }
          }
        },
        toolbox: {
          feature: {
            dataView: { show: true, readOnly: false },
            magicType: { show: true, type: ['line', 'bar'] },
            restore: { show: true },
            saveAsImage: { show: true }
          }
        },
        legend: {
          data: ['蒸发量', '降水量', '平均温度']
        },
        xAxis: [
          {
            type: 'category',
            data: [
              '1月',
              '2月',
              '3月',
              '4月',
              '5月',
              '6月',
              '7月',
              '8月',
              '9月',
              '10月',
              '11月',
              '12月'
            ],
            axisPointer: {
              type: 'shadow'
            }
          }
        ],
        yAxis: [
          {
            type: 'value',
            name: '水量',
            min: 0,
            max: 250,
            interval: 50,
            axisLabel: {
              formatter: '{value} ml'
            }
          },
          {
            type: 'value',
            name: '温度',
            min: 0,
            max: 25,
            interval: 5,
            axisLabel: {
              formatter: '{value} °C'
            }
          }
        ],
        series: [
          {
            name: '蒸发量',
            type: 'bar',
            data: [
              2.0,
              4.9,
              7.0,
              23.2,
              25.6,
              76.7,
              135.6,
              162.2,
              32.6,
              20.0,
              6.4,
              3.3
            ]
          },
          {
            name: '降水量',
            type: 'bar',
            data: [
              2.6,
              5.9,
              9.0,
              26.4,
              28.7,
              70.7,
              175.6,
              182.2,
              48.7,
              18.8,
              6.0,
              2.3
            ]
          },
          {
            name: '平均温度',
            type: 'line',
            yAxisIndex: 1,
            data: [
              2.0,
              2.2,
              3.3,
              4.5,
              6.3,
              10.2,
              20.3,
              23.4,
              23.0,
              16.5,
              12.0,
              6.2
            ]
          }
        ]
      }
      myChart.setOption(option)
    }
  }
}
</script>

<style lang="less" scoped></style>
